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Journeyman Electrician Part 1
Ultimate Exam
Question 1. Which formula correctly represents Ohm’s Law for calculating voltage? A) V = I × R B) V = P ÷ I C) V = I ÷ R D) V = P × R Answer: A Explanation: Ohm’s Law states that voltage (V) equals current (I) multiplied by resistance (R). Question 2. If a 120 V circuit draws 10 A, what is the power consumed? A) 120 W B) 1,200 W C) 12 W D) 10 W Answer: B Explanation: Power P = V × I = 120 V × 10 A = 1,200 W. Question 3. In a single-phase AC system, the term “frequency” refers to: A) The number of voltage cycles per second B) The phase angle between voltage and current C) The magnitude of voltage D) The resistance of the circuit Answer: A Explanation: Frequency is measured in hertz (Hz) and indicates cycles per second. Question 4. Which NEC Article defines “accessible” as a term? A) Article 100
Journeyman Electrician Part 1
Ultimate Exam
B) Article 210 C) Article 250 D) Article 300 Answer: A Explanation: Article 100 contains definitions for terms used throughout the NEC. Question 5. The most common type of non-metallic sheathed cable used in residential wiring is: A) MC cable B) AC cable C) NM-B (Romex) D) UF cable Answer: C Explanation: NM-B cable, often called Romex, is the standard residential wiring method. Question 6. The minimum clearance required between a service-entrance conductors and a door opening in a detached garage is: A) 3 ft B) 6 ft C) 4 ft D) 2 ft Answer: C Explanation: NEC 230.70(A)(1) requires a 4-ft clearance from the service entrance to any door, window, or similar opening. Question 7. When sizing a feeder based on a 150 A load with a 75 % demand factor, the required ampacity is: A) 112.5 A
Journeyman Electrician Part 1
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C) Ground rod driven ≥8 ft D) Aluminum siding attached to the building Answer: D Explanation: Aluminum siding is not an approved grounding electrode. Question 11. The size of a Grounding Electrode Conductor (GEC) for a 100 A service using copper is: A) #8 AWG B) #6 AWG C) #4 AWG D) #10 AWG Answer: B Explanation: NEC Table 250.122 specifies #6 AWG copper for a 100 A rating. Question 12. An Equipment Grounding Conductor (EGC) is required to be sized based on: A) The size of the neutral conductor B) The rating of the overcurrent protective device (OCPD) C) The length of the circuit D) The type of conduit used Answer: B Explanation: EGC size is chosen according to the OCPD rating per NEC Table 250.122. Question 13. Which of the following is considered a “bonding jumper”? A) A neutral-to-ground connection at the service panel B) A conductor that connects metal conduit to the ground bus C) A grounding electrode rod
Journeyman Electrician Part 1
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D) A THHN wire in a branch circuit Answer: B Explanation: Bonding jumpers ensure electrical continuity between metallic raceways and the grounding system. Question 14. According to NEC, the identification color for a grounded (neutral) conductor larger than 6 AWG must be: A) White or gray B) Green C) Black D) Red Answer: A Explanation: NEC 200.6 requires white or gray identification for neutrals of any size, though larger conductors may use a marking tape. Question 15. In Table 310.16, the ampacity of 4 AWG copper THHN at 75 °C is: A) 55 A B) 70 A C) 85 A D) 95 A Answer: C Explanation: The table lists 85 A for 4 AWG copper at 75 °C. Question 16. When two conductors are installed in a conduit that is 30 °C above the ambient temperature correction factor, the ampacity must be: A) Reduced by 10 % B) Reduced by 20 % C) Reduced by 30 % D) Not adjusted
Journeyman Electrician Part 1
Ultimate Exam
Answer: C Explanation: UF (Underground-Feeder) cable is rated for direct burial and wet locations. Question 20. A 20-amp GFCI receptacle must be installed in which location according to NEC 210.8(A)(2)? A) Bedroom B) Garage C) Living room D) Hallway Answer: B Explanation: GFCI protection is required for receptacles in garages. Question 21. The minimum height for a standard single-pole breaker in a panelboard is: A) 4 in from the floor B) 6 in from the floor C) 30 in from the floor D) No specific height, only clearance required Answer: D Explanation: NEC 408.2 requires clear working space, not a specific mounting height. Question 22. A “tamper-resistant” receptacle is required in: A) All commercial locations B) All dwelling unit receptacles C) Only outdoors D) Only industrial settings
Journeyman Electrician Part 1
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Answer: B Explanation: NEC 210.12 mandates tamper-resistant receptacles in all dwelling unit receptacle outlets. Question 23. The correct size of a circuit breaker for a 4500-W electric water heater operating at 240 V is: A) 15 A B) 20 A C) 25 A D) 30 A Answer: B Explanation: Current = 4500 W ÷ 240 V = 18.75 A; the next standard breaker size is 20 A. Question 24. For a 30-amp dedicated circuit feeding a kitchen range, the required conductor size (copper) is: A) #10 AWG B) #8 AWG C) #6 AWG D) #12 AWG Answer: B Explanation: Table 310.15(B)(16) shows #8 AWG copper is rated for 40 A, suitable for a 30-A circuit with a 125 % safety factor. Question 25. Which device provides short-circuit protection for a motor rated at 5 hp, 460 V, three-phase? A) Standard 15-A breaker B) Inverse-time circuit breaker sized per NEC Table 430. C) Fused disconnect sized per NEC Table 430.
Journeyman Electrician Part 1
Ultimate Exam
B) Rigid metal conduit (RMC) with approved conductors C) PVC conduit with THHN D) Underground feeder (UF) cable Answer: B Explanation: Rigid metal conduit provides the necessary protection for Class I, Division 2 areas. Question 29. According to NEC 680.22, a swimming pool pump motor must be protected by a: A) Standard circuit breaker only B) GFCI receptacle C) Ground-fault circuit interrupter (GFCI) breaker of not more than 30 A D) No special protection required Answer: C Explanation: NEC requires a GFCI breaker (≤30 A) for pool pump motors. Question 30. An emergency system must be supplied from a separate source that is: A) Connected to the normal load side of the service panel B) Isolated from the normal power source and capable of automatic transfer C) Fed through a shared breaker with the lighting circuit D) Supplied by a generator without an automatic transfer switch Answer: B Explanation: NEC 700.12 requires an independent source with automatic transfer for emergency systems. Question 31. NFPA 72 defines a “power-limited” circuit as one that: A) Has a voltage not exceeding 30 V B) Has a voltage not exceeding 100 V and a limited power rating
Journeyman Electrician Part 1
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C) Is supplied from a dedicated transformer D) Is protected by a fuse only Answer: B Explanation: Power-limited circuits are limited to 100 V and a specific power rating per NFPA 72. Question 32. For a Category 6 data cable run, the maximum recommended length for 1 Gbps Ethernet is: A) 50 m B) 75 m C) 100 m D) 150 m Answer: C Explanation: ANSI/TIA- 568 - C specifies 100 m as the maximum for Cat 6 at 1 Gbps. Question 33. In a residential solar PV system, the DC-side disconnect must be located: A) Within 5 ft of the inverter B) At the service equipment only C) No farther than 25 ft from the PV array D) Anywhere on the roof Answer: C Explanation: NEC 690.13 requires the DC disconnect to be readily accessible and not more than 25 ft from the array. Question 34. The grounding conductor for a photovoltaic system must be identified by: A) Green insulation only B) Green with yellow stripe or bare copper
Journeyman Electrician Part 1
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A) 40 % of the conduit’s internal cross-sectional area B) 53 % of the conduit’s internal cross-sectional area C) 31 % of the conduit’s internal cross-sectional area D) 25 % of the conduit’s internal cross-sectional area Answer: A Explanation: For more than two conductors, the maximum fill is 40 % of the conduit’s internal area. Question 38. The NEC permits the use of aluminum conductors in branch circuits if they are: A) Used only for grounding B) Labeled “CU-AL” C) Rated for the appropriate temperature and sized per Table 310.15(B)(16) D) Never allowed in branch circuits Answer: C Explanation: Aluminum conductors may be used when correctly sized and rated for the circuit. Question 39. Which of the following is a permitted method for grounding a metal conduit that is not in contact with the earth? A) Relying on the conduit’s metallic nature alone B) Installing a bonding jumper to the grounding bus at each outlet box C) Connecting a grounding conductor to the conduit at each junction box and at the service panel D) No grounding required if the conduit is continuous Answer: C Explanation: NEC requires a grounding conductor to be bonded to metal conduit at each box and at the service panel.
Journeyman Electrician Part 1
Ultimate Exam
Question 40. The required size of a grounding electrode conductor for a 200 A service using copper is: A) #8 AWG B) #6 AWG C) #4 AWG D) #2 AWG Answer: C Explanation: Table 250.122 lists #4 AWG copper for a 200 A service. Question 41. According to NEC 210.24, a 20-amp receptacle circuit in a dwelling unit may supply a maximum of: A) 8 receptacles B) 10 receptacles C) 12 receptacles D) 6 receptacles Answer: A Explanation: NEC Table 210.24 permits up to 8 receptacles on a 20-amp branch circuit. Question 42. Which type of circuit breaker is required for a 240-V, 30-A dryer circuit? A) Single-pole 30-A breaker B) Two-pole 30-A breaker C) GFCI 20-A breaker D) Arc-fault breaker Answer: B Explanation: A dryer is a 240-V appliance and must be protected by a two-pole breaker of the appropriate rating.
Journeyman Electrician Part 1
Ultimate Exam
Question 46. The NEC allows the use of a 120-V, 20-A GFCI receptacle in a bathroom for: A) Lighting only B) Any appliance, including hair dryers C) Only for low-power devices under 180 W D) It is not permitted in bathrooms Answer: B Explanation: GFCI protection is required for all receptacles in bathrooms, regardless of load. Question 47. For a 1500 W electric baseboard heater operating at 240 V, the required branch-circuit breaker size is: A) 10 A B) 15 A C) 20 A D) 30 A Answer: B Explanation: Current = 1500 W ÷ 240 V = 6.25 A; the next standard breaker is 15 A, which is acceptable. Question 48. The NEC defines a “continuous load” as a load that: A) Operates for more than 1 hour continuously B) Operates for more than 3 hours continuously C) Operates intermittently throughout the day D) Operates only during peak demand periods Answer: B Explanation: Continuous loads run for 3 hours or more.
Journeyman Electrician Part 1
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Question 49. Which of the following is NOT a permitted method for supporting non-metallic sheathed cable? A) Stapling within 4 in. of a box B) Running the cable through a conduit for support C) Attaching with cable ties every 6 ft D) Securing within 12 in. of a box using a listed cable clamp Answer: C Explanation: Cable ties are not an approved method for supporting NM cable per NEC 334.30. Question 50. The minimum size of a grounding electrode conductor for a 400 A service using aluminum is: A) #4 AWG B) #2 AWG C) #1/0 AWG D) #4/0 AWG Answer: C Explanation: Table 250.122 lists #1/0 AWG aluminum for a 400-A service. Question 51. The NEC requires a minimum of ___ inches of space between a panelboard and the nearest combustible wall. A) 6 in B) 12 in C) 18 in D) 24 in Answer: B Explanation: NEC 110.26 requires a 30-in. clear working space, but the minimum clearance from a wall is 12 in.
Journeyman Electrician Part 1
Ultimate Exam
Question 55. In a residential installation, the maximum number of conductors allowed in a 3/4-in. EMT without derating is: A) 3 B) 5 C) 7 D) 9 Answer: C Explanation: Table 1 of Chapter 9 limits the number of conductors before applying derating; for 3/4-in. EMT, the limit is 7 conductors. Question 56. A receptacle installed in a bathtub area must be: A) GFCI-protected only B) Weather-resistant only C) Both GFCI-protected and weather-resistant D) No special requirements Answer: C Explanation: NEC 210.8(A)(10) requires GFCI protection, and 410.10(D) requires weather-resistant receptacles in damp locations. Question 57. Which type of conduit is allowed in a wet location without a moisture-tight fitting? A) EMT B) Rigid metal conduit (RMC) C) PVC conduit D) Flexible metal conduit (FMC) Answer: C Explanation: PVC conduit is non-metallic and suitable for wet locations without additional fittings.
Journeyman Electrician Part 1
Ultimate Exam
Question 58. The NEC requires a disconnecting means for a photovoltaic array of what minimum rating? A) Equal to the array’s maximum power point current B) Equal to the array’s short-circuit current C) At least 125 % of the array’s maximum current D) No disconnect required for residential systems Answer: C Explanation: NEC 690.13 requires a disconnect rated at least 125 % of the array’s maximum current. Question 59. Which of the following is considered a “premise wiring” method? A) Underground feeder (UF) cable B) Service-entrance conductors C) Solar PV array wiring D) Transformer secondary conductors Answer: A Explanation: UF cable is a type of premise wiring used for interior and exterior runs. Question 60. The NEC permits the use of a 4-wire feeder (two hots, neutral, ground) to supply a 240-V, 30-A range. The neutral conductor may be: A) Removed if not needed for a 120-V load B) Left unconnected at the range C) Connected to the range’s control board only D) Must be present and bonded at the range Answer: A Explanation: If the range does not require a neutral for 120-V components, the neutral can be omitted.
